Considering this same electron–hole system in a van der Waals (vdW)
heterostructure, their potential energy is accurately modeled by the
Rytova–Keldysh potential [1]}, [2]}
\(V_{RK}\left(r\right)=-\frac{\pi }{2r_{0}}\left[\mathbf {H}_{0}\left(\kappa \frac{r}{r_{0}}\right)-\mathbf {Y}_{0}\left(\kappa \frac{r}{r_{0}}\right)\right],\) 
